レール継目での衝撃が箱断面上路鈑桁床組の疲労に及ぼす影響

抄録

Due to an impact load caused by wheel passing rail joint, fatigue cracks tend to occur around rail joint. In order to evaluate effects of the impact load on fatigue at the deck system of a steel box girder, stress measurement was carried out at the existing bridge. As a result, the impact load at the rail joint generated two types of high frequency natural mode vibration of around 40 and 350 Hz. And, those vibrations increased the range and cycle of the stress at the welding joint of the deck system.